We spent two weeks in the Bighorn Mountains, WY. Our site was way down in the trees so minimal solar. We decided to get a Honda 2200i generator to pump up the batteries. We'll end up in this situation in the future and can run the AC while bookdocking. So we did.

Fired up the Honda and hooked it up to the trailer. The converter started charging the batteries, but REALLY slowly. Did a little Internet research and found the stock converter from Escape has a really poor charging cycle. This doesn't matter if you're plugged into an electrical bush (hook up), just let it run all night and the batteries are up. But it is a problem if you want to minimize generator use (noise).

I found a converter with much better changing that retrofits the stock one. Installed this and it works considerably better. Problem solved.